Post on 14-Jul-2015
Auto Scaling
with
Ruby, AWS, Jenkins
and Redis
hello!
I am
JeDDie
A software engineer. A Rails Girls volunteer.
Auto Scaling
with
Ruby, AWS, Jenkins
and Redis
1.
Auto Scaling?
Scalability.
“Methods of adding more resources for a particular
application fall into two broad categories:horizontal and vertical scaling.
http://en.wikipedia.org/wiki/ScalabilityMichael, Maged; Moreira, Jose E.; Shiloach, Doron; Wisniewski, Robert W. (March 26, 2007).
"2007 IEEE International Parallel and Distributed Processing Symposium"
Scale Vertically
▸ Scale up and down
about SCALABILITY
Scale Horizontally
▸ Scale out
scale up
scale down
1
4
Okay,
and WHY?
needs auto scaling
about
our office
❤ Taiwan
Place your screenshot hereContent Matters
When the live show attracts people, they will become audience right away.
柯P：一個更好的台北2014-11-29
158,157 clicks
10,400 ccu
2.
Amazon Web Services
What we need for auto scaling.
AWS
require “aws”
auto_scaling = ec2 + cli + elb + elasti_cache
3.
Amazon EC2
Elastic Compute Cloud
Amazon EC2
▸ Amazon Elastic Compute Cloud○ “A web service that provides resizable compute
capacity in the cloud”○ “Designed to make web-scale cloud computing
easier for developers”■ Scale up/down; start, stop, terminate...etc.
EASY management with a great UI.
AMI
▸ Amazon Machine Images○ “A template for the root volume for the instance
(for example, an operating system, an application server, and applications)”
A script of an instance.
4.
AWS CLI
Command Line Interface
AWS CLI
▸ AWS Command Line Interface○ “A unified tool to manage your AWS services”
■ AWS CLI and AWS EC2 CLI■ Github
● aws/aws-sdk-ruby● aws/aws-cli
○ Access key■ AWS Identity and Access Management (IAM)
API.
Process of Launching Instance
Launch instance using image Allocate IP Associate IP
with instance
`ec2-run-instances #{AMI_ID} #{REGION}#{GROUP} #{SUBNET} #{INSTANCE_TYPE}
#{BLOCK_DEVICE_MAPPING}`
Launch an Instance Using an Image.
launch
instanceImage
ID
security
group
small?
large?
additional
store volume
ec2-run-instances
ec2-run-instances ami-1a2b3c4d -s subnet-1a2b3c4d -t c1.medium
OUTPUT>RESERVATION r-1a2b3c4d 111122223333INSTANCE i-1a2b3c4d ami-1a2b3c4d pending
c1.medium YYYY-MM-DDTHH:MM:SS+0000 10.0.0.146 …
from Amazon doc
`ec2-allocate-address -d vpc #{REGION}`
Allocate an Elastic IP for use.
virtual private cloud
ec2-allocate-address
ec2-allocate-address -d vpc
OUTPUT>ADDRESS 198.51.100.1 vpc eipalloc-5723d13e
from Amazon doc
`ec2-associate-address#{ALLOCATION_ID} #{INSTANCE_ID} #{REGION}`
Associates an Elastic IP with an Instance.
bind IP and
instance
elastic ip
ec2-associate-address
ec2-associate-address -a eipalloc-5723d13e -i i-4fd2431a
OUTPUT>ADDRESS i-43a4412a eipalloc-5723d13e
eipassoc-fc5ca095
from Amazon doc
Do all
in One Step
?
Do All in One
▸ Pros○ Simple flow
▸ Cons○ Legacy > 5 mins
Facts that matter
Break Things Down
▸ Pros○ Flexible to handle
▸ Cons○ Different entries by
time
It takes 5 minutes to run an instance up
process
launch + IP
go online
process
Process of Terminating Instance
Disassociate IP from instance Release IP Terminate
instance
`ec2-disassociate-address #{ASSOCIATION_ID} #{REGION}`
Disassociates Elastic IP from Instance.
the link
ec2-disassociate-address -a eipassoc-048c746d
OUTPUT>ADDRESS eipassoc-048c746d
example from Amazon doc
`ec2-release-address #{ASSOCIATION_ID} #{REGION}`
Release Elastic IP.
ec2-release-address -a eipassoc-048c746d
OUTPUT>ADDRESS eipassoc-048c746d
example from Amazon doc
`ec2-terminate-instances #{INSTANCE_ID}#{REGION}`
Shutdown Instance.
PROMPT> ec2-terminate-instances i-1a2b3c4d
OUTPUT>INSTANCE i-1a2b3c4d running shutting-down
example from Amazon doc
5.
AWS ELB
Elastic Load Balancing
AWS ELB
▸ Elastic Load Balancing○ “Automatically distributes incoming application
traffic across multiple Amazon EC2 instances in the cloud.”
Traffic-monitoring UI and the metrics.
Icon made by Freepik from www.flaticon.com is licensed under CC BY 3.0
`elb-register-instances-with-lb #{LOAD_BALANCER} #{INSTANCE_ID} #{REGION}
#{CREDENTIAL_FILE}`
Make Load Balancer Know Instance.
elb-register-instance-with-lb
aws elb register-instances-with-load-balancer --load-balancer-name my-test-loadbalancer --instances i-4e05f721
OUTPUT>
{ "Instances": [ {"InstanceId": "i-315b7e51"}, {"InstanceId": "i-4e05f721"} ]}
from Amazon doc
`elb-deregister-instances-with-lb #{LOAD_BALANCER} #{INSTANCE_ID} #{REGION}
#{CREDENTIAL_FILE}`
Cut Instance out from Load Balancer.
aws elb register-instances-with-load-balancer --load-balancer-name my-test-loadbalancer --instances i-4e05f721
OUTPUT>
{"Instances": [{"InstanceId": "i-315b7e51"}]}
from Amazon doc
`aws elb describe-instance-health #{LOAD_BALANCER} #{REGION}`
Returns the current state of the instances
registered with the specified load balancer.
describe-instance-health
aws elb describe-instance-health --load-balancer-name MyHTTPSLoadBalancer
OUTPUT>
{ "InstanceStates": [ {"InstanceId": "i-cb439ec2", "ReasonCode": "N/A", "State": "InService", "Description": "N/A"} ]}
from Amazon doc
`mon-get-stats #{METRIC} #{NAMESPACE}#{STATISTICS} #{REGION} #{DIMENSIONS}
#{CREDENTIAL_FILE}`
Get time-series data for one or more statistics
of a given Metric.
get time-series
data
requestCount,
HTTPCode_Backend_2XX, ...
aws/elb
sum
lb name
mon-get-stats
mon-get-stats RequestCount --statistics "Sum" --namespace "AWS/ELB"
OUTPUT>
2015-01-29 12:01:00 687.0 Count
2015-01-29 12:02:00 753.0 Count
2015-01-29 12:03:00 836.0 Count
from Amazon doc
Elements
ELB
monitor traffic
EC2
launch or terminate instance
ElastiCache
trackinstance status
6.
Amazon ElastiCache
Redis
Amazon ElastiCache
▸ Amazon ElastiCache○ “makes it easy to deploy, operate, and scale an
in-memory cache in the cloud”
Redis, a key-value database.
Redis
“Redis is an open source, BSD licensed, advanced key-value
cache and store. ”- http://redis.io
Different data structures:strings, hashes, lists, sets, ...
Icon made by Carlos Prioglio from www.iconfinder.com is licensed under CC BY-NC-SA 3.0
7.
Auto Scaling!
Automation.
Auto Scaling
Icons made by Freepik from www.flaticon.com is licensed under CC BY 3.0
Let’s auto scale!
Icon made by SimpleIcon from www.flaticon.com is licensed under CC BY 3.0
A Robot’s Day
Its name is Bee!
Icon made by Freepik from www.flaticon.com is licensed under CC BY 3.0
Monitor Traffic
▸ CLI○ elb-register-instances-with-lb○ mon-get-stats
Decide a Threshold
▸ Observe what has happened
time
request
The Basic Process
▸ Basic actions○ ec2-run-instances○ ec2-allocate-address○ ec2-associate-address○ elb-register○ elb-deregister○ ec2-disassociate-address○ ec2-release-address○ ec2-terminate-instances
Watch for Status
▸ Now what should be done?○ Add/remove instance
■ Number of online-servers■ Traffic and threshold
○ Register/deregister instance with load balancer○ Update instance status
■ pending / Initializing / running / stop / problem○ White List○ Limitation
■ Time■ Scaling
Icon made by Freepik from www.flaticon.com is licensed under CC BY 3.0
Track Things Down
▸ Online instances▸ Waken instances▸ Problem instances
Redis data type: List.i-abcde01
i-bcdef02
i-cdefg03
Track Things Down
▸ Instance information▸ The timestamp of the last instance
initialized
Redis data type: String.i-abcde01: "{id: i-abcde01, status: initializing, private_ip: 192.168.0.1, public_ip: 54.12.23.34, created_at: 2015/01/20 14:03:00}"
Release
8.
Deployment
Let’s meet other robots!
http://capistranorb.com/
Icon made by Charles Lowell and Frontside from jenkins-ci.org is licensed under CC BY-SA 3.0
Always put the NEWEST service online.
Icon made by OCHA , icon made by Freepik, icon made by Sarfraz Shoukat from www.flaticon.com is licensed under CC BY 3.0
Icon made by Charles Lowell and Frontside from jenkins-ci.org is licensed under CC BY-SA 3.0
with Jenkins
Auto Scaling + Deployment
New pre and post processes.
Original
Deployment
Get
servers’
IP
Build Image
Get
servers’
IP
`aws ec2 describe-instances #{REGION} --filters "Name=instance-state-name,Values=running" "Name=instance.group-name,Values=FrontEnd" "Name=tag-value,Values=FrontEnd Production*" "Name=ip-address,Values=*"`
RESERVATION r-1a2b3c4d 111122223333INSTANCE i-1a2b3c4d ami-1a2b3c4d running my-key-pair 0 m1.small YYYY-MM-DDTHH:MM:SS+0000 us-west-2b windows monitoring-disabled 50.112.172.209 10.0.0.167 vpc-1a2b3c4dsubnet-1a2b3c4d ebs hvm xen ABCDE1234567890123sg-1a2b3c4d default falseBLOCKDEVICE /dev/sdb vol-1a2b3c4d YYYY-MM-DDTHH:MM:SS.SSSZtrueNIC eni-1a2b3c4dsubnet-1a2b3c4d vpc-1a2b3c4d111122223333in-use10.0.1.167 trueNICATTACHMENT eni-attach-1a2b3c4d 0 attached YYYY-MM-DDTHH:MM:SS+0000trueGROUP sg-1a2b3c4d my-security-groupPRIVATEIPADDRESS 10.0.1.167PRIVATEIPADDRESS 10.0.1.12TAG instance i-1a2b3c4d Name Windows
from Amazon doc
Build Image
`ec2-create-image #{INSTANCE_ID} #{NAME} #{DESCRIPTION} --no-reboot #{REGION}`
ec2-create-image i-10a64379 --name "Standard Web Server" --description "Standard web server AMI"
OUTPUT>
IMAGE ami-4fa54026
from Amazon doc
Do we solve it? NOT yet!
Good communication matters!
icons made by Freepik from www.flaticon.com is licensed under CC BY 3.0
Happy Auto Scaling!Icon made by Freepik from www.flaticon.com is licensed under CC BY 3.0
Thanks!
anyquestions
?
You can find me atjeddie@livehouse.in
Credits
Special thanks to all the people who made and released these awesome resources for free:▸ Busy Icons by Olly Holovchenko▸ Presentation template by SlidesCarnival▸ Photographs by Unsplash▸ Paper backgrounds by SubtlePatterns▸ Other icons are from
▸ http://www.freepik.com▸ http://www.flaticon.com▸ https://livehouse.in▸ http://jenkins-ci.org